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Mica cleaves into thin elastic sheets because its structure consists of

  • A.a three-dimensional framework of tetrahedra
  • B.silicate sheets weakly bonded to one another
  • C.silicate chains weakly bonded to one another
  • D.isolated tetrahedra held by weak cations

Answer: B

The bonds within a sheet are strong and those between sheets weak, so the mineral splits into flakes in one direction only. That perfect basal cleavage is what makes mica a plane of weakness in any rock containing much of it.

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